4-hydroxy-9-methyl-4-vinyl-1,2,3,4-tetrahydrocarbazole

ABSTRACT

Indolosteroids having the following formulas are disclosed   These compounds are useful as an adjunct in skin grafts.

United States Patent 1 I [111 3,920,694

Sircar et al. Nov. 18, 1975 4-HYDROXY-9-METHYL-4-VINYL-l,2,3,4-

TETRAHYDROCARBAZOLE [75] Inventors: Jagadish C. Sircar, Dover; Harold Zinnes, Rockaway, both of NJ.

[73] Assignee: Warner-Lambert Company, Morris Plains, NJ.

[22] Filed: Feb. 18, 1975 [21] Appl. No.2 550,334

Related US. Application Data [62] Division of Ser. No. 475,559, June 3, 1974.

[52] US. Cl 260/315; 260/240 R; 424/274 [51] Int. Cl. C07D 209/88 [58] Field of Search 260/315 [56] References Cited FOREIGN PATENTS OR APPLICATIONS 1,225,664 3/1971 United Kingdom 2 60/315 OTHER PUBLICATIONS J. Chem. Soc. C.- 1970: 325-326, Coombes et al. J. Org. Chem. 30: 1550-1553 (1965), Dolby et al.

Primary Examiner-Sherman D. Winters Attorney, Agent, or Fir m-Albert I-I. Graddis; Frank S.

Chow These compounds are useful as an adjunct in skin grafts.

[57] ABSTRACT Indolosteroids having the following formulas are dis- 1 Claim, No Drawings closed 4-HYDROXY-9-METHYL-4-VINYL-l,2,3,4-TET- RAHYDROCARBAZOLE This is a division, of application Ser. No. 475,55 filed June 3, 1974. v 5 The present invention relates to indolosteroids. More specifically the present invention relates to 6,12a-dimethylindeno-[4,5c]-carbazoles of the formulas:

I CH5 N N CH3 S I I :II

Broadly speaking, the above compounds are pre-[ pared according to the following reaction scheme:

III

CH; VII

NaBlh,

Referring to the above' scheme, 9-methyl-4-keto- 1,2,3,4-tetrahydrocarbazole III is reacted with vinyllithium in a solvent such as tetrahydrofuran to give IV. This is reacted with 2-methylcyclopentanedione using a strong basic catalyst such as benzyltrimethylarirmonium hydroxide available commercially as Triton B (.I. T. Baker Co., Eastman Kodak, etc.) to give a mixture of V and VI, the latter being the predominant product. Both V and VI undergo facile dehydration in the presence of acids such as hydrochloric acid or ptoluene-sulfonic acid to form VII. Reduction with a complex metal hydride such as sodium borohydride of VII gives the alcohol VII which is converted to com.- pound I by stirring with Raney Nickel catalyst in a solvent such as tetrahydrofuran. Compound 11 is obtained by passing a stream of oxygen through a solution of VII in a solvent such as a mixture of alcohol and chloroform.

The starting compound III is prepared as described by H. J. Teuber and D. Cornelius, Ann. Chem. 671; 127 (1964).

The compounds of the invention are useful as adjunct agents in skin graft therapy. For example, they exhibit the property to prolong the survival of allografts in laboratory animals such as mice. Thus at an i.p. dose of mg/kg to 100 mg/kg they prolong the life span of allografts in mice.

They are indicated as an adjunct in skin graft therapy to suppress host rejection of the graft within the above dose range. This dose can be varied depending upon the condition of the host being treated.

These compounds are administered subcutaneously or intramuscularly in dosage forms suitable for such administration. For example, they are combined with a vehicle such as a peanut oil, sesame oil and compounded with dosage forms by known pharmaceutical technology.

In order to illustrate further the practice of the present invention, the following examples are included.

XAMPLE v1 4-Hydroxy-9-methyl-4-vinyl-1,2,3 ,4-tetrahydrocarbazole.

A suspension of 67 g (0.33 mol) of 4-keto-9-methyl- 1,2,3,4-tetrahydrocarbazole in 1700 ml of tetrahydrofuran was cooled to and 1.0 mol (as a 2.9 molar solution in tetrahydrofuran) of vinyllithium was added over a 75 min period. The reaction mixture was allowed to slowly warm up to room temperature, stirred for 2 hr, decomposed with ice-water, and extracted with dichloromethane. The dichloromethane solution was concentrated to a small volume (not to dryness) and an oil separated from solution. The upper solvent layer was decanted from the oil and the latter was triturated with ether to give 60 g of product, mp 91-95 dec, which was of sufficient purity for use as an intermediate for further reactions. A portion was dissolved in tetrahydrofuran and petroleum ether was added till crystals separated. The first crop (mp 93) was filtered off and the mother liquor was concentrated to give a second crop, mp 96 dec. This second crop was recrystallized in the same manner to give an analytical sample, mp 9597 dec.

Anal. Calcd for C I-I NO: C, 79.26; H 7.54; N, 6.16. Found: C, 79.30; H, 7.72; N, 6.18. v 3300, 1610, 1558 cm. 1

EXAMPLE 2 3,3a,4,5,6,1 1,12,12a-Octahydro-6,l2a-dimethyl-3- hydroxyindene [4,5c]-carbazol-1(2H)-one.

To a solution of 56.8 g (0.25 mol) of 4-hydroxy-9- methyl-4-vinyl-l,2,3,4-tetrahydrocarbazole in a mixture of 500 ml of xylene and ml of tert-butanol was added 28.1 g (0.25 mol) of 2-methylcyclopentan-l,3- dione. The mixture was stirred at room temperature for 15 minutes, 10.8 ml of 40% methanolic Triton B was added, and it was refluxed under a nitrogen atomsphere for 3 hr, using a Dean-Stark separator to remove the water which formed during the reaction. The reaction mixture was filtered away from insoluble unreacted 2- methyl-cyclopentan-l,3-dione and the filtrate was washed successively with 5% potassium hydroxide solution, aqueous sodium chloride solution, and water. The dried (Na SO organic layer was concentrated to a volume of about 200 ml and diluted with 500 ml of ether. The resulting precipitate (52 g) was collected and stirred at room temperature, under nitrogen, for 30 min with 450 ml of dichloromethane. The insoluble component (3.8 g) was collected and purified by dissolving in 250 m1 of tetrahydrofuran, concentrating the resulting solution to 100 ml and diluting with 100 ml of ether. The resulting crystalline product, mp 180 dec. weighed 3.2 g

Anal Calcd for C2 H23NO2: C, H, N, 4.36. Found: C, 78.15; H, 7.33; N, 4.20. v 3450, 1718, 1650, 1604 cm.

EXAMPLE 3 5. 2-Methyl-2[2-( l ,2,3 ,4-tetrahydro-9-methylcarbazol 4- fylidene)-ethyl]-l-,3-cyclopentanedione.

- atroomtemperature for 21hr, concentrated under re- The dichloromethane filtrate from the previously described experiment was concentrated to a smallavolume and diluted with ether to cause precipitation. of 45 g ;of product, mp 165l70 dec (material turned green at 95 and shrank at about 155 before melting) .Th is mafrom dichloromethan'e-ether gave 7.6 g of additional I product, mp 168172 dec (turned green at 97).

EXAMPLE 4 I 4,5,6,l 1,12,12a-Hexahydro-6,l2a-dimethylindeno- [4,5-c]-carbazol-l(2H)-one Method A A mixture of 48.0 g (0.15 mol) of 2-[2-(1,2,3,4-tetrahyd ro-9-methylcarbazol-4-ylidene )-ethyl -2-methylcyclopentane-l ,3-dione, 2.4 g of p-toluenesulfonic acid.

and 1500 ml of benzene was refluxed under a nitrogen atmosphere for 10 min during which time the theoretical yield of water was collected in a Dean Stark water separator. The reaction mixture was cooled and 'the dark green solution was decanted from a tarry residue. This solution was diluted with dichloromethane, washed successively with sodium carbonate,.water, and

' saturated sodium chloride solution, dried over sodium sulfate, and evaporated to dryness. The resulting yellow solid was recrystallized from dichloromethane-acetonitrile to give g of product, mp 195197'dec.

Anal. Calcd forC H NO: C, 83.13; H, 6.98; N, 4.62. Found: C, 82.91; H, 6.96; N, 4.58. 11 1738, 1604, 1535. A a 248 (21,000), 284 (12,500), 330(e12,800)mu.

Concentration of the mother liquor and dilution with ether gave 7.0 g of a less pure second crop, mp 183-190 dec.

Method B To a mixture of 1.07 g (0.0033 mol) of 3,3a,4,5 ,6,1 l ,12,12a-octahydro-6,12a-dimethyl-3- hydroxyindene[4,5c]-carbazol-1(2H)-one and 60 ml of tetrahydrofuran was added 12 ml of 18% hydrochloric acid. The resulting clear solution was allowed to stand.

d uced pressure-to one-third its volume, and slowly poured into ice cold saturated sodium carbonatesolution. Themixture was stirred at iceeb'athfftemperature for 30 min andthe resulting yellow solid wasicollected, washed well with Water and dried in vacuo over phosphorous pei'itt iiride'. This solid (1.04 g, mp 175182 dec) was recrystallized several times from acetonitrile to give 463* mg of product, -r'np l93."195 dec.

, EXAMPLE, 5

1,2,4,5 ,6,l1,l2,12a-Octahydro-6,lZa-dimethyl-lhydroxyindeno-[4,5c]carbazole.

To a suspension of 10.0 g (0.033 mol) of 4,5,6,1 1,12,l 2a-hexahydro-6,lZa-dimethylindeno- [4,5.-c]-carbazol'-1(2l-1)-one in 375 ml of 95% ethanol was added 4.1 g of sodium borohydride followed by 25 ,ml of water. The mixture was stirred at room temperature for 20 hr, 600 m1 of water was added, and it was stirred an additional 3 hr. The resulting precipitate was collected and dried in vacuo over P 0 to give 10 g of product, mp 179l 8 1 dec which was sufficiently pure for use as an intermediate for subsequent reactions. Re-

crystallization by dissolving in tetrahydrofuran and diluting with ethergave 6.9 g of material, mp l78l80 dec.

Anal. Calcd for C l-l NO: C, 82.59; H, 7.59; N, 4.59. Found: C, 82.45; H, 7.47; N, 4.62. v 3430,

1608, 1540, 1535 cm. A 248 (632,400), 283

EXAMPLE 6 over night. The catalyst was filtered off, the solvent was evaporated, and the solid residue was triturated with ether to give 8.7 g of crystalline product, mp 2l722l 6,1 1,,12,12a-Tetrahydro-6,l2-a-dimethylindeno-[4,5- c -carbazol- 1 (2H )-one.

A stream of oxygen was passed through a solution of 5.0 g (0.0165 mol) of 4,5,6,l1,12,12a-hexahydro- 6,12a-dimethylindeno-[4,5-c]-carbazol-1(2H)-one in a mixture of 300 ml of chloroform and 300 ml of ethanol for 48 hr. It was concentrated to a volume of about 200 ml and the resulting precipitate was collected, washed with ether, and dried to give 2.2 g of pink crystalline solid, mp 230240. Recrystallization by dissolving in dichloromethane and dilution with acetonitrile gave 1.6 g of pink crystalline product, mp 243-246 dec. Another recrystallization gave an analytical sample, mp 244246 dec.

Anal. Calcd for C H NO: C, 83.69; H, 6.35; N, 4.65. Found: C, 83.65; H, 6.47; N, 4.49. A""' 1725, 1580, 1475 cm. 1.'':,,,,,, 254 (34,400), 284 (50,800), 341 (3,800). 358 (3,800) my.

We claim:

1. A compound of the formula: 

1. A COMPOUND OF THE FORMULA: 